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Commitments and Contingencies (Minimum Future Rental Payments) (Details)
$ in Thousands
Dec. 31, 2016
USD ($)
Operating Leased Assets [Line Items]  
2017 $ 1,481
2018 1,140
2019 and on 1,159
Related Party [Member]  
Operating Leased Assets [Line Items]  
2017 $ 50